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Abstract

We experimentally demonstrate an all-optical analog to electromagnetically induced transparency (EIT) on chip using coupled high-Q silica microtoroid cavities with Q-factors above 106. The transmission spectrum of the all-optical analog to EIT is precisely controlled by tuning the distance between the two microtoroids, as well as the detunings of the resonance frequencies of the two cavities.

Figures (4)

(a) Schematic diagram of the experimental setup for measuring the transmission spectrum of the coupled microtoroid cavities. (b) Top-view optical microscope image of the two coupled microtoroid cavities coupled to a tapered fiber. The diameters of the two microtoroids are 60.4 µm and 67.5 µm, respectively. VOA: variable optical attenuator.

Measured and theoretically calculated transmission spectra of the coupled microtoroid system for various coupling rates of the two coupled WGMs when the first toroid is undercoupled (a) and overcoupled (b). The top curves are the transmission spectra of the first microtoroid coupled to a tapered fiber waveguide in the absence of the second microtoroid. The loaded Q factor of the first microtoroid is 0.94 × 106 for (a) and 0.33 × 106 for (b). The temperature of the second toroid is 64.11 °C for (a) and 65.17 °C for (b), respectively. The coupling between the two coupled WGMs is controlled by changing the distance between the two cavities.

Measured and theoretically calculated transmission spectra of the coupled microtoroid system for various frequency detunings of the coupled WGMs. The top curve is the transmission spectrum of the first microtoroid coupled to the tapered fiber waveguide in the absence of the second microtoroid. The tuning is controlled by change the temperature of the second microtoroid.